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Week07刷题记录

题号 名称 难度 备注 次数
[206] 反转链表 🟢 简单 迭代、递归 3
[24] 两两交换链表中的节点 🟡 中等 - 2
[142] 环形链表 II 🟡 中等 判断链表环结合数学推理 1
[109] 有序链表转换二叉搜索树 🟡 中等 高频,找到中间点依次递归 2
[104] 二叉树的最大深度 🟢 简单 DFS、标准BFS模板 3
[78] 子集 🟡 中等 递归标准题、思路:可加可不加 1
[46] 全排列 🟡 中等 循环递归回溯 1
[77] 组合 🟡 中等 循环递归回溯 1

排列问题,均用递归,且均需要reverse,需要输出相同长度时(全排列、组合)循环

| [64] | 最小路径和 | 🟡 中等 | - | 2 | | [72] | 编辑距离 | 🔴️ 困难 | 转换为二维表格动规 | 2 | | [242] | 有效的字母异位词 | 🟢 简单 | - | 3 |

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